(loosely) A contradiction in terms. Historically, an oxymoron was a paradox with a point, where the contradiction seems absurd at first glance, and yet is deliberate, its purpose being to underscore a point or to draw attention to a concealed point.
By far the most massive planet in our solar system, Jupiter features giant hurricanes, auroras, abstract artistic cloudswirls, and maybe even a solid core. It also protects Earth by gravitationally clearing the solar system of asteroids and comets.
Even if you include the moon, it's still quite stable: the moon actually acts as a kind of stabilizer for the earth. The longer answer is that the system does contain other planets, most notably Jupiter. The pull of Jupiter on Earth is extremely small, and irregular.